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Journal of Bacteriology, September 1998, p. 4903-4911, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Two Functionally Distinct Regions Upstream of the cbbI Operon of Rhodobacter sphaeroides Regulate Gene Expression

James M. Dubbs and F. Robert Tabita*

Department of Microbiology and the Plant Molecular Biology/Biotechnology Program, The Ohio State University, Columbus, Ohio 43210-1292

Received 30 December 1997/Accepted 21 July 1998

A number of cbbFI::lacZ translational fusion plasmids containing various lengths of sequence 5' to the form I (cbbI) Calvin-Benson-Bassham cycle operon (cbbFIcbbPIcbbAIcbbLIcbbSI) of Rhodobacter sphaeroides were constructed. Expression of beta -galactosidase was monitored under a variety of growth conditions. It was found that 103 bp of sequence upstream of the cbbFI transcription start was sufficient to confer low levels of regulated cbbI promoter expression; this activity was dependent on the presence of an intact cbbR gene. Additionally, R. sphaeroides CbbR was shown to bind to the region between 9 and 100 bp 5' to the cbbFI transcription start. Inclusion of an additional upstream sequence, from 280 to 636 bp 5' to cbbFI, resulted in a significant increase in regulated cbbI promoter expression under all growth conditions tested. A 50-bp region responsible for the majority of this increase occurs between 280 and 330 bp 5' to cbbFI. The additional 306 bp of upstream sequence from 330 to 636 bp also appears to play a positive regulatory role. A 4-bp deletion 281 to 284 bp 5' to cbbFI significantly reduced cbbI expression while the proper regulatory pattern was retained. These studies provide evidence for the presence of two functionally distinct regions of the cbbI promoter, with the distal domain providing significant regulated promoter activity that adheres to the normal pattern of expression.

* Corresponding author. Mailing address: Department of Microbiology, The Ohio State University, 484 West 12th Ave., Columbus, OH 43210-1292. Phone: (614) 292-4297. Fax: (614) 292-6337. E-mail: Tabita.1{at}osu.edu.

Journal of Bacteriology, September 1998, p. 4903-4911, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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